From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794240119; b=S/Vp/nd8wyrQRfPS2KCPQmcSiFkcM4Th5P4d173CbjOyOil+jimrH7mJtKVoMRrYa54W aEOkBmouaYJ2jayOD1NTftyZOLXG7C4BvCsLnBfbZgafvmy+65BrdJfthcNgTirqVfECA bYJqPhYBBoR2L+hzOxYkVWWowHJF7gPg2Yji+KooqhYfMRgNCzHBwqxv4A6vgFwzk22Zz dU5KTuagnrZgSLDabukcXSSHiWLgH1hoysFxV5NdSAFjZAobvSyQRXwyzsK+eEUiVvAkR 7gU4oem/kQNTw7/3KZG9NKKtgjsyKVAP3P6JreQ4necbmn0xXPVeMZjZcV4PkKHvSLw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794240119; h=DMARC-Filter:Received:Received:DKIM-Signature:From:Date:Subject: MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id: References:In-Reply-To:To:Cc:X-Mailer:X-Developer-Signature: X-Developer-Key; bh=s+XtcHjlveo6Rt1z/HHzt1Q4WWTxizmEkz/Ti/n8JwQ=; b=YOtDmOqL9KJDS2/gpE7tVDd0byv4aRlcLBhOXGXceSHAzWNjGloip8wn6pXTGAoj4iEb Blh7X5mkVitvM+R0l3Vl5qJ2YDLclFkfbNCN5jBBhRKTmq9nR0ruQrqWuqwZN31K3QiZJ 7QD2A4O/kFVL5XbyCtWF2WVA5BvEME5AirGtZwhfxME1GfH93zU62+yxIjprOD6fdpkvf //F9KPZuO8aSugK+GSrZ04DWWKhMK47XF0J73DlNLRAbcIgdDWJ3h9AFM+A+hi2/rM6CV dpA8DTjTN9Q4jCpK5baVGUKhyUa2G73u7kDgSVKiG7zlmhA/OJgMhnpZpJBHxG2fk8g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=OQ0L8REn; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C61F46082BDB; Mon, 9 Nov 2026 16:01:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org C61F46082BDB Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=OQ0L8REn Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 47B902F; Mon, 9 Nov 2026 08:01:55 -0800 (PST) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.2.208.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6BCE23F632; Mon, 9 Nov 2026 08:01:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1794240118; bh=0JuT+uildmhaEgn52zC1lunzUYu7ZIusFUBCe2xiZdw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=OQ0L8REnTHidFM5WIxAuRaOX8lI9jHDoPNsgAWQY0L6rdsqvGaNTupVYA9RPVplio T3F6kLb8WJULkHTF1GMu/FxhXXoINGvTkSTZ0tFdGgL0KBbeGPDN3ADLHM9p06YZbb uT79RWGna60K/cuVtj0vXs46ya8uuyMv7kHuVp6c= From: Kevin Brodsky Date: Mon, 09 Nov 2026 15:58:41 +0000 Subject: [PATCH RFC v10 16/22] arm64: kpkeys: Support KPKEYS_CTX_PGTABLES X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261109-kpkeys-v10-16-aa6c4d9603bc@arm.com> References: <20261109-kpkeys-v10-0-aa6c4d9603bc@arm.com> In-Reply-To: <20261109-kpkeys-v10-0-aa6c4d9603bc@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Ard Biesheuvel , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linu Cherian , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , =?utf-8?q?Pierre-Cl=C3=A9ment_Tosi?= , Quentin Perret , Rick Edgecombe , Ryan Roberts , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Ira Weiny , Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1794240029; l=1222; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=0JuT+uildmhaEgn52zC1lunzUYu7ZIusFUBCe2xiZdw=; b=X75PO42OizELIjHMA+pg9ABYfNK2RBjNkvixe0qpHeh6AeI5trotCclhD2ML1Ni/zKshehgvQ erzJBrYq6p6DNE9At7ub+oahLytHUeXMooZPd2GoK489VN1B/az7QpE X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= Enable RW access to KPKEYS_PKEY_PGTABLES (used to map page table pages) if switching to KPKEYS_CTX_PGTABLES, otherwise only grant RO access. Reviewed-by: Yeoreum Yun Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/kpkeys.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/kpkeys.h b/arch/arm64/include/asm/kpkeys.h index 70d85b0d69d6..6f6022b6cdcc 100644 --- a/arch/arm64/include/asm/kpkeys.h +++ b/arch/arm64/include/asm/kpkeys.h @@ -12,7 +12,8 @@ * Equivalent to por_set_kpkeys_context(0, KPKEYS_CTX_DEFAULT), but can also be * used in assembly. */ -#define POR_EL1_INIT POR_ELx_PERM_PREP(0, POE_RWX) +#define POR_EL1_INIT (POR_ELx_PERM_PREP(0, POE_RWX) | \ + POR_ELx_PERM_PREP(KPKEYS_PKEY_PGTABLES, POE_R)) #ifndef __ASSEMBLY__ @@ -33,6 +34,8 @@ static inline bool arch_supports_kpkeys_early(void) static inline u64 por_set_kpkeys_context(u64 por, enum kpkeys_ctx ctx) { por = por_elx_set_pkey_perms(por, 0, POE_RWX); + por = por_elx_set_pkey_perms(por, KPKEYS_PKEY_PGTABLES, + ctx == KPKEYS_CTX_PGTABLES ? POE_RW : POE_R); return por; } -- 2.56.0